Method of making fertilizers.



UNITE STATES PATENT OFFICE",

WILSON B. ANesTADT A D KILBURN H. OLEAVER, on READING,

PENNSYLVANIA.

METHOD OF MAKl NG FERTILIZEIiS.

SPECIFICATION forming part of Letters Patent No. 683,014, datedSeptember 94, ieoi.

7 Application flied May 15, 1901. $ei'ia1 No. 611L375. (No specimens.)

T0 aZZ whom it may concern:

Be it known that we, WILsoN B. ANGSTADT and KILBURN H. OLEAVER, citizensof the United States, residing at Reading, in the county of Berks andState of Pennsylvania, have invented certain new and useful Improvementsin Processes of Making Fertilizers; and we do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same;

This invention relates to improvements in the process of makingfertilizers.

It consists of a simple, cheap, and effective manner of reducing greenor raw refuse table and kitchen matter, commonly called garbage,directly to a marketable product. The process whereby this isaccomplished is fully described in the following specification.

We take the green or raw material, a combination of vegetable and animalmatter such as comprises the offal from the table and kitchen, in anyquantity that can be handled conveniently and apply thereto sulfuricacid that has been heated to approximately 400 Fahrenheit in greaterquantity than is sufficient to reduce said matter to a pulpy condition.A quantity of ground phosphate rock is then added to this mass, and thesurplus sulfuric acid contained in said mass Will acidulate thephosphate rock,while at the same time a certain proportion of themoisture therein will be absorbed by said rock. After this is done asufficient quantity of another suitable absorbing material, such as dryearth, is added to the mass to thoroughly absorb all free moisture orliquid contained therein, leav ing a substantially dry substance. Thissubstance is then put through the usual screening and grinding process,and the result is a high-grade fertilizer in granulated form de riveddirectly from animal and vegetable ref use at a minimum of time andexpense.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent,- is- The process of makingfertilizer from ref-' use vegetable and animal matter by first treatingsaid matter in a raw state with highlyheated sulfuric acid, in aquantity more than sufficient to reduce said matter to a pulpycondition, then adding ground phosphate rock which is acidulated by thesurplus sulfuric acid, then adding a suitable dry substance to absorbthe remaining moisture, and finally screening and grinding saidsubstance, substantially as described. I

In testimony whereof we affix our signatures in presence of twoWitnesses.

WILSON B. ANGSTADT. KILBURN H. CLEAVER.

Witnessesi B. A. FRYER, FRED H. WITMAN.

